Re: International Direct Dialling (IDD) provision throughout the UK
International calls were certainly very expensive and were not generally used for social purposes. Australia was particularly expensive, a place where lots of Brits had relatives, and it was common to send voice messages on 3" reels of tape by air mail. This continued into the cassette era, though by then IDD had arrived and costs had come down somewhat (though calls were still very expensive by today's standards).
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